Fire alarm



June 23, 1931. T. c. DUNCAN FIRE ALARM Filed Sept.

ATTORNEY' Patented June 23, 1931 r 1 i ,i..'

i' UNITE THOMAS C. DUNCAN, OF PORTSMOUTH, VIRGINIA FIRE ALARM Application filed September 5, 1930. Serial No. 479,989.

Th1s invention relates to a fire alarm, the at low cost so that a number of these devices general ob1ect of the lnventlon being to procan be bought at a low price and placed at vide a casing containing explosive material, various parts of a building. If a fire should ith means whereby the casing can be atbreak out near one of these devices the fuse h d t a 11 oof, ceiling or any other would be quickly ignited and the resultant fire is likely to occur, so that explosion would notify persons that the cur at this point, the device building is on fire. thereby notify persons that It is thought from the foregoing descripa fire has broken out. tion that the advantages and novel features of This invention also consists in certaln other the invention will be readily apparent. features of construction .and in the combma- It is to be understood that chan es may tion and arrangement f the eral parts, to be made in the construction and in the combe hereinafter fully described, illustrated in bination and arrangement of the several 5 the ing drawlngs and specifically arts, provided that such changes fall withpointed out in the appended claim. 1n the scope of the appended claim. v I d ibing the invention in detail, ref- What I claim is erence will be had to the accompanying draw- A device of the class described comprisin ings h i lik characters denote like or a casing having explosive material thereiri ts throughout the several a fuse passing through one end of the casin and pro ecting therefrom, the other end of the caslng being flattened and having a hole therein for receiving a nail or the like to Figure 2 is a front view of the device. fasten the deviceto a support and a covering Figure 3 is a section on line 33 of Figof inflammable and waterproof material fiture 2. ting over the casing and havingone end extended and enclosing the projecting part of In these drawings, the numeral 1 indicates a casing formed of any suitable material and the fuse. containing explosive mater1al2. One end of In testimony whereof I affix my signature.

0 the casing is closed by the plug 3 and a fuse 4c THOMAS C. DUNCAN,

asses through the plug and has one end embedded in the explosive material'and its other end projecting from the device. The other end of the casing is flattened at its front, as 7 shown at 5, with a hole 6 formed therein so that a nail 7 or the like can be passed through 5 the hole to fasten the device to a wall or other support, as shown in Figure 1.

A cover 8 encloses the device and has its lower end extended to enclose the projecting end of the fuse, as shown at 9. This cover 7 is preferably formed of celluloid which protects the device from moisture and the like and which also acts to cause the fuse to be 45 quickly ignited if a fire should occur near the device, due to the combustibility of the cel- 7 luloid. The upper end of the cover 8 conforms to the shape of the upper end of the device, as shown.

Thus I have provided a simple form of fire alarm which can be manufactured to sell place where a if a fire should 00 will explode and corresponding par vlews, and in wh1ch:-

Figure 1 1s a s1de view showing the device attached to a wall. 

